Which one of the following statements is not correct?

A$.$

The categories of a Gutenberg Corpus overlap with each other.

B$.$

A list is typically a sequence of objects all having the same type of arbitrary length.

C$.$

There are strong constraints on what verbs can occur with what complements.

D$.$

N$-$gram taggers can be defined for large values of n$,$ but once n is larger than $3,$ we usually encounter the sparse data problem.